He held fast to great ideals and to an intellectually rigorous world view.

It was here Gordon acted at his best, intellectually rigorous, totally driven, sure in his touch.

Suhrawardi was as intellectually rigorous as al-Farabi but he also insisted on the importance of intuition in the approach to truth.

Hadlow said BBC4 was able to explore intellectually rigorous subjects, free from the pressure for ratings that comes with the bigger channels.